IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain.
Molecules. 2021 Jul 12;26(14):4229. doi: 10.3390/molecules26144229.
Polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants that can arrive to water bodies from their use as flame retardants in a wide range of applications, such as electric and electronic devices or textiles. In this study, the photodegradation of PBDEs in water samples when applying UV-LED radiation was studied. Irradiation was applied at three different wavelengths (255 nm, 265 nm and 285 nm) and different exposure times. The best degradation conditions for spiked purified water samples were at 285 nm and 240 min, resulting in degradations between 67% and 86%. The optimized methodology was applied to real water samples from different sources: river, marine, wastewater (effluent and influent of treatment plants) and greywater samples. Real water samples were spiked and exposed to 4 hours of irradiation at 285 nm. Successful photodegradation of PBDEs ranging from 51% to 97% was achieved for all PBDE congeners in the different water samples with the exception of the marine one, in which only a 31% of degradation was achieved.
多溴二苯醚（PBDEs）是持久性有机污染物，它们可能会作为阻燃剂在各种应用中（如电子和电气设备或纺织品）进入水体。在这项研究中，研究了在应用 UV-LED 辐射时水中 PBDEs 的光降解情况。在三种不同的波长（255nm、265nm 和 285nm）和不同的暴露时间下进行了照射。在 285nm 和 240 分钟的条件下，对加标净化水样的最佳降解条件下，降解率在 67%至 86%之间。优化后的方法应用于不同来源的实际水样：河水、海水、废水（处理厂的出水和进水）和灰水样品。对实际水样进行加标，并在 285nm 下照射 4 小时。除了海水样品外，所有水样中的所有 PBDE 同系物都实现了 51%至 97%的成功光降解，而在海水中，仅实现了 31%的降解。
